Validation of broadband infrared normalization in sum-frequency generation vibrational spectroscopy through simultaneous chiral terms on α-quartz crystal

Li，Jia Jie1,2; Zeng，Wei Wang2,3; Zeng，Wen2,3; Zeng，Qiong1,2; Zhou，Chuanyao2; Yang，Xueming2,4; Ren，Zefeng1,2

2023-06-01

10.1063/1674-0068/cjcp2303020

Chinese Journal of Chemical Physics   Impact Factor & Quartile

1674-0068

2327-2244

Sum-frequency generation vibrational spectroscopy (SFG-VS) has been widely used for characterizing various interfaces. However, obtaining SFG signals with a high signal-to-noise ratio can be challenging for certain interfaces, such as those involving powder particles, which scatter the SFG light and make it difficult to obtain accurate spectra. To address these challenges, we developed a new approach using a z-cut α-quartz crystal as the substrate loaded with a very small amount of powder sample. This approach not only amplifies the SFG signal from particles through the interference of the electric field from the quartz crystal, but also allows for phase reference and normalization of the broadband infrared SFG spectrum. By distinguishing the different polarizations of the SFG light, we were able to separate and simultaneously collect the achiral and chiral SFG signals. We used the chiral SFG signal to normalize the achiral SFG intensity, thereby avoiding any potential changes to the interface caused by loading substances onto the quartz, as well as coincidence differences resulting from the instability of light at different moments. We demonstrated our method by measuring the adsorption of CHOD on a quartz substrate loaded with MoC nanoparticles. Our approach produced a high signal-to-noise ratio SFG spectrum, regardless of the interface situation.

Broadband IR Methanol MoC Normalization Powder Sum-frequency generation vibrational spectroscopy α-Quartz

SCI

English

Others

Ministry of Science and Technology of China[2018YFA0208700] ; National Natural Science Foundation of China[21688102]

Physics

Physics, Atomic, Molecular & Chemical

WOS:001038602300003

CHINESE PHYSICAL SOC

2-s2.0-85166139327

Scopus

1.Department of Chemical Physics,University of Science and Technology of China,Hefei,230026,China
2.State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,116023,China
3.University of Chinese Academy of Sciences,Beijing,100049,China
4.Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China

Li，Jia Jie,Zeng，Wei Wang,Zeng，Wen,et al. Validation of broadband infrared normalization in sum-frequency generation vibrational spectroscopy through simultaneous chiral terms on α-quartz crystal[J]. Chinese Journal of Chemical Physics,2023,36(3):265-271.

Li，Jia Jie.,Zeng，Wei Wang.,Zeng，Wen.,Zeng，Qiong.,Zhou，Chuanyao.,...&Ren，Zefeng.(2023).Validation of broadband infrared normalization in sum-frequency generation vibrational spectroscopy through simultaneous chiral terms on α-quartz crystal.Chinese Journal of Chemical Physics,36(3),265-271.

Li，Jia Jie,et al."Validation of broadband infrared normalization in sum-frequency generation vibrational spectroscopy through simultaneous chiral terms on α-quartz crystal".Chinese Journal of Chemical Physics 36.3(2023):265-271.